/***********设置图片尺寸***********/
section img{
    width: 100vw;
    height: 50vw;
}
/****************main**************/
section{

}
.sec{
    margin-top: 7vh;
    position: relative;
}
.sec1{
    margin-top: 0vh;
    position: relative;
}
.zi{
    height: 13vw;
    width: 25vw;
    /*border: 1px solid red;*/
    position: absolute;
    bottom: 0vh;
    left: 3vw;
}
.zi .sp1{
    color: white;
    font-size: 1rem;
}
.zi .sp2{
    color: darkorange;
    font-size: 0.8rem;
}
.tu{
    height: 8vw;
    width: 25vw;
    /*border: 1px solid red;*/
    position: absolute;
    bottom: 1vh;
    right: 3vw;
}
.tu span{
    color: white;
}
.tu .sp3{
    position: absolute;
    top: 2vw;
    left: 2vw;
}
.tu .sp4{
    /*margin: 2vw 0px 0px auto;*/
    position: absolute;
    top: 3vw;
    right: 4vw;
}
/************footer************/
footer{
    width: 100vw;
    height: 3vh;
    background-color: black;
    margin-top: 0px;
}
footer span{
    width: 150px;
    color: white;
    display: block;
    margin: 0px auto;
    font-size: 0.8rem;
}